阅读下面的短文，根据短文的内容回答问题。
Many people do the same things on their birthday： They have a big cake with lots of candles(蜡烛), and listen to their friends and family sing“Happy Birthday to You”.①    would you like to pay money to sing that song?
Jennifer Nelson is a filmmaker. ②And she used the song“Happy Birthday to You”in her film.③但是她必须为此支付1,500美元。A company named Warner Music Group said it had the copyright(版权) on the song.
“I never thought the song was owned(拥有) by anyone,”Nelson said in the e-mail to the New York Times.
Some experts(专家) said that nobody knew who wrote“Happy Birthday to You”.They also said there was no way to know ④       people began to sing the song. But they believed(相信) people started to sing it long before the company began to own ⑤it.
在①处填入一个适当的连词使句意完整、上下文通顺：
将②处划线部分译成汉语：
将③处划线部分译成英语：
在④处填入一个适当的疑问句使句意完整、上下文通顺：
文中⑤处划线部分的it指代：